DMARC-Filter:	OpenDMARC Filter v1.4.2 delorie.com 536KX6Jg1049462
Authentication-Results:	delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results:	delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter:	OpenDKIM Filter v2.11.0 delorie.com 536KX6Jg1049462
Authentication-Results:	delorie.com;
	dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=su8H1ZJP
X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 659E1385DDDC
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1743971584;
	bh=fgyylPuPmvwPdkEhp4gTLRxCNfh2nMcczsnY0YvEeSk=;
	h=Date:To:Subject:List-Id:List-Unsubscribe:List-Archive:List-Post:
	List-Help:List-Subscribe:From:Reply-To:From;
	b=su8H1ZJPewxYBFzMJFDfzUOra1xSeddJD0HUdmsaDM7XszqBsKsljlwlk4PVqv2yN
	RRq46t9B2HVN+ZwR7E5KC1pZUeIa92ULfuoTW8PaeQsXigTHkBoOAZpUOFCzcoe2Z8
	nfwGln0P+XqBr9B38BF7akVyekyNwd7okd5OeCt0=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.2 sourceware.org AC78C385DDCA
ARC-Filter:	OpenARC Filter v1.0.0 sourceware.org AC78C385DDCA
ARC-Seal:	i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1743971560; cv=none;
	b=PVBREKzTQmwEl9iVb4+qN7QLhkfwZ4ERdBIUCqFvOQ7DUR6ubP2hTjTd0cYByGh6QbgK4XpEb4EkSLQ6NSX7GuK5iZl5ahzHGjwmPS3dKdFqlrbCmZ3R6gqqYEKoLWfAyXRi7+qQai6SxxzBBMob7txWnMhflweSS8SZulwz3cM=
ARC-Message-Signature:	i=1; a=rsa-sha256; d=sourceware.org; s=key;
	t=1743971560; c=relaxed/simple;
	bh=lgP8W7fZkk2s/u6f8yIIKOcfzClWFeEUGEmHfhrsfmQ=;
	h=DKIM-Signature:Message-ID:Date:MIME-Version:From:To:Subject;
	b=awnMrP+A4k/5RnUPf1EXXN3SIu/tE/Afa0D1KYd5wxjyTL1+aph3FYC/Rj8J6TEDNA9jy91Q3dGRNMi+pYnNVAtEHx7xX31mbgy6EIOFeA4vd6XOgHY6HJRdOmOlYxCd/zJDrY5qki6FjMT04whCXzE0HdOVBwW9nc9UQuR91zo=
ARC-Authentication-Results:	i=1; server2.sourceware.org
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org AC78C385DDCA
X-Google-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=1e100.net; s=20230601; t=1743971559; x=1744576359;
	h=content-transfer-encoding:subject:to:from:content-language
	:user-agent:mime-version:date:message-id:x-gm-message-state:from:to
	:cc:subject:date:message-id:reply-to;
	bh=QOyZFKFb2ET77U/HMykqZlXCrTdMOiPAovzgbLhVh3k=;
	b=A0vfLWcTOKe5o39TZ6C/4PEkIuBfBGO5wVetFhoqG5C41yk5VxVfKtGfbNK+FCCCfq
	76JklpJ0I/MHs58f9aBv1SB6OMiTELmD8BIwSB2OKUx36+RvnDtCdA0VeVnV7RdtOQsu
	InoFtQURrXRQ5cAO6/Fp0XwimnemhVZVlIZeeJfnZO9TVaCfvh3imYdpTlU7wjD8zpW3
	bmxj9gW1z1uvhaMwOc9KPX+ssB6BZJXJ7Mkj4/ZzpU1xiHdUkyHnQPIr9hJpBLTE6mXY
	oGfjEXmU5JYLTX1mGmECUdCVniF99eBEWUFX8ycY34OjO8VKx/kGLAfSCngKneBTM3Mm
	ghTA==
X-Gm-Message-State:	AOJu0YwvrSJZgwTUKrKeoUcfVodAJu/F4dfJw1FgryarGpj43fsMBH//
	OTZ6DPkfPImW5psDHDx1Lmi3SemFWtbdhtxIAO4cqFvcMg03WFo7puDscSI/dHVy4CDEutP2pXd
	vllIv81HBNsYicN6ISnKYaFOQu9DN/nFmL/vfBysH2EuZwuAbkD6TPxt7bvutat9b0zVhavOg46
	XHpeenbhSb67bDjPNnkcxI1itqBhtsA85fx/IVr8Pqu1Lro0kO7tDbRoEFYY1CUZL49nRAIA==
X-Gm-Gg:	ASbGnctq3oBelDjBGvFucpxAHkrfnY0YHRg5voJuf3nrYQNwA0frrir2g5JwUrwNCvQ
	XiHlbPpoXg3zsvUei+Tb6p6fCwzPLo94+qUAz/zlwDTJ0KocAEoUHKtVUoWeQwaSBGwYIiWG8GU
	rWUufUuaQFqWr5ZH+3flW8CsADgv/bMYUP8JaCwZPwmavrEp87XM9lsj9ozABYmQwtmTSabITut
	Y74NfbXHcyObqEEyZ6FamgWDY6lgNlN07cKPt0pQ+ry5xG8RBoMC0SueLF8rnPvqyhd17CmEckQ
	YWrHhCvmfy4XyKXu6lxqqFqgpq+q358o8xhjX+UROkwJb6z2iv5PgDSNt+gqJNOtqq3NOrMNfYe
	SeEVA+E949QmbbGs=
X-Google-Smtp-Source:	AGHT+IEVpvP/wkmmB3jeEtZW0yZ1E2IY0Fme2u2aCrrdSHEL5ZcB0V4Z61scJvBJT2ai1HHX9mCpQQ==
X-Received:	by 2002:a05:620a:370c:b0:7c5:49b7:237c with SMTP id
	af79cd13be357-7c77dd7d43amr1003317185a.27.1743971559115;
	Sun, 06 Apr 2025 13:32:39 -0700 (PDT)
Message-ID:	<5cbe7341-f1b3-429c-a84a-fafe58408463@umbc.edu>
Date:	Sun, 6 Apr 2025 16:32:36 -0400
MIME-Version:	1.0
User-Agent:	Mozilla Thunderbird
To:	cygwin AT cygwin DOT com
Subject:	Python 3.12 testing
X-CLOUD-SEC-AV-Sent:	true
X-CLOUD-SEC-AV-Info:	umbc,google_mail,monitor
X-Gm-Spam:	0
X-Gm-Phishy:	0
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.30
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	dwes1--- via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	dwes1 AT umbc DOT edu
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>
X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 536KX6Jg1049462

To the Python maintainer and anyone else testing Python 3.12:

A few weeks ago, the python developer requested help with evaluating the 
Python 3.12 release.
I downloaded the python312-test package, and worked out that
python -m test.test_threading -v
failed during the second test in the file, sometimes with an immediate 
segfault, sometimes by hanging
until I tried to attach gdb, which immediately reported an empty stack 
and a null stack pointer.

Adding print calls to the test narrowed the point of failure to some 
time during thread cleanup,
so I ran the test under gdb, adding breakpoints to pthread_exit and 
pthread::exit, which caught
the test before the segfault, and displayed a stack working back to 
pthread_wrapper, whose caller
was set to null.  Stepping through the function eventually reached a 
call to ExitThread, then the
segfault with no reported stack.

My current guess is that ExitThread somehow returns, leading to control 
falling off the end of
pthread_wrapper and failing to return.  (This is rather more sensible 
than my previous guess
that Python had somehow managed to call the NULL pointer recursively, 
and not noticed until
gdb took a look at things)  I suppose I could try to compile Cygwin with 
an error message after
ExitThread to see if that prints, but I am otherwise out of ideas.

I first checked this around January on a Windows 10 machine from 2016, 
then on a machine from
within the last year that is says it is also Windows 10.

I hope this helps


-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -